Microwave oven



FIG. 1 is a front perspective view of a microwave oven showing our new design;

FIG. 2 is a perspective view taken from the right side thereof;

FIG. 3 is a right side elevational view thereof.

The bottom and rear surface of the oven are substantially planar and unornamented. 

The ornamental design for a microwave oven, as shown and described. 